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Added fat_seek()

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@271 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-04-27 20:03:05 +00:00
parent 9a3c16dea8
commit 0ea9f3772a
2 changed files with 31 additions and 0 deletions
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28
firmware/drivers/fat.c
View file

@ -860,6 +860,34 @@ int fat_read(struct bpb *bpb,
return sectorcount; return sectorcount;
} }
int fat_seek(struct bpb *bpb,
struct fat_fileent *ent,
int seeksector )
{
int cluster = ent->firstcluster;
int sector;
int numsec = 0;
int i;
for (i=0; i<seeksector; i++) {
numsec++;
if ( numsec >= bpb->bpb_secperclus ) {
cluster = get_next_cluster(bpb,cluster);
if (!cluster)
/* end of file */
return -1;
sector = cluster2sec(bpb,cluster);
if (sector<0)
return -2;
numsec=0;
}
}
ent->nextcluster = cluster;
ent->nextsector = sector;
ent->sectornum = numsec;
return 0;
}
int fat_opendir(struct bpb *bpb, int fat_opendir(struct bpb *bpb,
struct fat_dirent *ent, struct fat_dirent *ent,

3
firmware/drivers/fat.h
View file

@ -115,6 +115,9 @@ extern int fat_read(struct bpb *bpb,
struct fat_fileent *ent, struct fat_fileent *ent,
int sectorcount, int sectorcount,
void* buf ); void* buf );
extern int fat_seek(struct bpb *bpb,
struct fat_fileent *ent,
int sector );
extern int fat_opendir(struct bpb *bpb, extern int fat_opendir(struct bpb *bpb,
struct fat_dirent *ent, struct fat_dirent *ent,